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A Terrorist Truck in Berlin

Germany needs a debate about migration and surveillance.

Dec. 20, 2016 6:51 p.m. ET

Last year the terror news was guns in a Parisian nightclub, and in March bombs at the Brussels airport. In July it was a truck at a Bastille Day fireworks show, and a few days after that an ax on a German train. On Monday evening a terrorist truck struck again, this time at a Christmas market in Berlin.

The death toll in the Berlin attack stands at 12, with dozens more injured. Islamic State (ISIS) claimed responsibility for the attack. The police arrested one person on Monday night but released him after finding no...